Component Inspection

Engine

Engine Control - P2271 O2 Sensor Signal Stuck Rich (Bank 1 Sensor 2) Component Inspection

Component Inspection

Check the condition of HO2S
1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is ensurely installed.
3. Is the conditions of HO2S normal?





Check the Signal waveform of HO2S
1. IG "OFF" and connect HO2S connector.
2. Engine start.
3. After warming-up, monitor signal waveform of HO2S with scantool.












Fig.1) Normal waveforms of front HO2S (the upper) and rear HO2S (the lower) (chassis ground used)
Fig.2) Normal waveforms of front HO2S (the upper) and rear HO2S (the lower) (sensor ground used)
4. Is the sensor switching properly?